Novel 9,9-dimethylfluorene-bridged D–π–A-type fluorophores with a hybridized local and charge-transfer excited state for deep-blue electroluminescence with CIE<sub>y</sub> ∼ 0.05

Qiu, Xu; Ying, Shian; Wang, Cong; Hanif, Muddasir; Xu, Yongbin; Li, Ya; Zhao, Ruiyang; Hu, Dehua; Ma, Dongge; Ma, Yuguang

doi:10.1039/c8tc05469j

Cited by 102 publications

(59 citation statements)

References 42 publications

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“…Ma designed and synthesized two novel D-π-A, 9,9-dimethylfluorene-bridged fluorophores (DFPBI and TFPBI) for efficient deep-blue OLED applications [103]. The non-doped devices, with DFPBI and TFPBI as emitters, exhibited deep-blue emission, with (0.154, 0.042) and (0.152, 0.054) CIE coordinates, accompanied by a good EL performance, with 4.18 and 5.74% EQE max values, respectively.…”

Section: Bi-based Fluorescent Materialsmentioning

confidence: 99%

Imidazole derivatives for efficient organic light-emitting diodes

Zhuang

Pan

et al. 2020

Journal of Information Display

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Since the first development of organic light-emitting diodes (OLEDs) in 1987, imidazole derivatives, mainly including phenanthroimidazole (PI) and benzimidazole (BI), have increasingly attracted attention. Their strong electron-withdrawing properties make them suitable for emitters, hosts, and electron-transporting materials (ETMs). In this review, an overview of the recent developments regarding OLEDs based on imidazole derivatives, especially the relationship between the molecule structure and the device performance as fluorescent and host materials, is given.

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Section: Bi-based Fluorescent Materialsmentioning

confidence: 99%

Imidazole derivatives for efficient organic light-emitting diodes

Zhuang

Pan

et al. 2020

Journal of Information Display

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“…According to the National Television System Committee or the European Broadcasting Union (EBU) standard, deep blue color is usually defined as the blue electroluminescence (EL) emission with a Commission International de L'Eclairage (CIE) coordinate of y < 0.08 or y < 0.06 respectively [5,6]. To obtain saturated deep blue organic light emitting diodes, many studies are conducted in molecule design [7][8][9][10]. More recently, Li et al designed a novel bipolar carbazole/phenanthroimidazole derivative named CzB-MOPPI, whose non-doped devices show the emission at 435 nm with a CIE of (0.16, 0.08), a maximum luminance of 6450 cd/m 2 , a maximum current efficiency (CE) of 3.34 cd/A and an external quantum efficiency (EQE) as high as 5.97% [11].…”

Section: Introductionmentioning

confidence: 99%

Color-Tunable Organic Light Emitting Diodes for Deep Blue Emission by Regulating the Optical Micro-Cavity

et al. 2020

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Nowadays, most blue organic light emitting diodes (OLEDs) are fabricated by using sky-blue emitters which are more easily synthesized when compared with other deep blue emitters. Herein, we put forward a new idea of using an optical micro-cavity based on metal electrodes to regulate electroluminance (EL) spectra of sky-blue organic light emitting diodes to obtain a saturated deep blue emission with a narrowed full-width at half-maximum (FWHM). First, we simulate micro-cavity OLEDs and find that the transmission of the anode plays an important role in the forward emission. Meanwhile, the optical path of micro-cavity OLEDs as well as the phase shifting from electrodes influence the EL spectra and induce the extra intensity enhancement. The results show that when the resonant cavity optical path is regulated by changing the thickness of emitting layer (EML) from 25 nm to 75 nm in the micro-cavity, the EL peak of blue OLEDs has a redshift from 479 nm to 493 nm with FWHM shifting from 69.8 nm to 83.2 nm, when compared to the device without the micro-cavity, whose approximate EL peak and FWHM are 487 nm and 87 nm, respectively. However, the efficiency of electroluminescence decreases in micro-cavity OLEDs. We speculate that this is on account of the ohmic contact between ITO and Ag, the surface plasma effect and the rough morphology induced by Ag electrodes.

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“…The external quantum efficiency (EQE) of D‐A type or D‐π‐A type blue fluorescent emitters was generally below 5% due to spin statistics limitation [ 23 ] and the blue emitters with above 5% EQE were mainly limited to pyrene or imidazole type materials. [ 24–31 ] Besides, the full width at half maximum (FWHM) was above 50 nm [ 31–35 ] and only very few emitters showed FWHM below 40 nm. [ 24 ] However, the D‐A and D‐π‐A type emitters also suffered from color purity due to intramolecular charge transfer (ICT) as it resulted in red‐shifted emission with broad spectrum.…”

Section: Introductionmentioning

confidence: 99%

Donor and Acceptor Fused 16,16‐Dimethyl‐11,16‐dihydrodibenzo[2,3:5,6]pyrrolizino[1,7‐ab]acridine as a Blue‐Emitting Chromophore for High External Quantum Efficiency and Long Lifetime

Patil

Lee

2020

Advanced Optical Materials

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The rigid molecular assembly formed by the fusion of the donor type acridine and acceptor type indolo[3,2,1‐jk]carbazole, namely 16,16‐dimethyl‐11,16‐dihydrodibenzo[2,3:5,6]pyrrolizino[1,7‐ab]acridine (ACDID), is developed as a new chromophore to give narrow emission in the blue region. The functionalization of the chromophore with phenyl and triphenylamine gives two fluorescence emitters, ACDID‐Ph and ACDID‐TPA, respectively. The in‐depth study of the emitters has confirmed that the triphenylamine unit in the ACDID‐TPA emitter enhances the external quantum efficiency (EQE) along with device stability. The ACDID‐TPA emitter shows high EQE of 6.3% and small full width at half maximum of 39 nm by the rigidity of the chromophore. The ACDID‐derived blue emitter performs better than the conventional pyrene‐derived emitter in terms of device lifetime, demonstrating the potential of the donor‐ and acceptor‐fused ACDID as the chromophore of blue emitters.

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Novel 9,9-dimethylfluorene-bridged D–π–A-type fluorophores with a hybridized local and charge-transfer excited state for deep-blue electroluminescence with CIE_y ∼ 0.05

Abstract: Deep-blue electroluminescence with a maximum EQE of 5.74% and CIEy ∼ 0.05 is achieved based on a newly designed D–π–A fluorophore with a HLCT excited state.

Cited by 102 publications

References 42 publications

Imidazole derivatives for efficient organic light-emitting diodes

Imidazole derivatives for efficient organic light-emitting diodes

Color-Tunable Organic Light Emitting Diodes for Deep Blue Emission by Regulating the Optical Micro-Cavity

Donor and Acceptor Fused 16,16‐Dimethyl‐11,16‐dihydrodibenzo[2,3:5,6]pyrrolizino[1,7‐ab]acridine as a Blue‐Emitting Chromophore for High External Quantum Efficiency and Long Lifetime

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Novel 9,9-dimethylfluorene-bridged D–π–A-type fluorophores with a hybridized local and charge-transfer excited state for deep-blue electroluminescence with CIEy ∼ 0.05

Abstract: Deep-blue electroluminescence with a maximum EQE of 5.74% and CIEy ∼ 0.05 is achieved based on a newly designed D–π–A fluorophore with a HLCT excited state.

Cited by 102 publications

References 42 publications

Imidazole derivatives for efficient organic light-emitting diodes

Imidazole derivatives for efficient organic light-emitting diodes

Color-Tunable Organic Light Emitting Diodes for Deep Blue Emission by Regulating the Optical Micro-Cavity

Donor and Acceptor Fused 16,16‐Dimethyl‐11,16‐dihydrodibenzo[2,3:5,6]pyrrolizino[1,7‐ab]acridine as a Blue‐Emitting Chromophore for High External Quantum Efficiency and Long Lifetime

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Novel 9,9-dimethylfluorene-bridged D–π–A-type fluorophores with a hybridized local and charge-transfer excited state for deep-blue electroluminescence with CIE_y ∼ 0.05